## anonymous 3 years ago factorise y^3-10y+3

1. Yacoub1993

$y ^{3}-10y+3=0$ $y ^{3}-10y=-3$ $-9y ^{3}=-3$ $y ^{3}=\frac{ -3 }{ -9 }$ $y ^{3}=\frac{ 1 }{ 3 }$

2. klimenkov

@Yacoub1993 Check the third step.

3. anonymous

y^3 and 10y not like terms???

4. Yacoub1993

ohh ok

5. anonymous

x-3 is a factor

6. Yacoub1993

mistaken didnt focus sorry

7. anonymous

$(x-3)(x^2+3x-1)$

8. Yacoub1993

9. anonymous

y you are putting it equal to zero??? @Yacoub1993

10. anonymous

its finished like that

11. Yacoub1993

so that i factorize it

12. anonymous

no no basically what you are trying to find a value of y such that if you put it in this equation will result in zero not to factorize it

13. Yacoub1993

ahha understood @rizwan_uet u should be my tutor for real :)

14. anonymous

15. anonymous

you have this y^3-10y+3 now we can write y^3+3y^2-3y^2-y-9y+3 y^3-3y^2+3y^2-9y-y+3 y^2(y-3)+3y(y-3)-1(y-3) can you do the last step??

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